You're using using format=32, which means `CARD32` aka `unsigned long`,
not to be confused with 32-bit integers, despite its name.
Switch from `int32_t` to `unsigned long`.
Cheers,
Antoine
On 09/05/2025 13:56, 406643764 wrote:
Hi, all.
I use XChangeProperty/XGetWindowProperty as following code:
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
int main(void)
{
Display *display=XOpenDisplay(NULL);
int screen=DefaultScreen(display);
Window root_win=RootWindow(display, screen);
Window win=XCreateSimpleWindow(display, root_win, -1, -1, 1, 1, 0,
0, 0);
Atom prop=XInternAtom(display, "test_prop", False);
Atom type=XInternAtom(display, "test_type", False);
int32_t a[]={0x11223344, 0x55667788};
XChangeProperty(display, win, prop, type, 32, PropModeReplace,
(unsigned char *)a, 2);
int fmt;
unsigned long nitems=0, n=0, rest;
unsigned char *p=NULL;
Atom atype;
if( XGetWindowProperty(display, win, prop, 0, 2, False,
type, &atype, &fmt, &n, &rest, &p) != Success
|| !atype || !fmt || !n || !p)
XFree(p), p=NULL;
long *d=(long *)p;
printf("%lx, %lx, %lu\n", d[0], d[1], rest);
XCloseDisplay(display);
return 0;
}
But the output is:
11223344, 1, 0
It should be:
11223344, 55667788, 0
What's wrong ?
------------------------------------------------------------------------
406643764
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